Year Percent of GDP (Units) 1983 47.930 1984 50.529 1985 53.042 1986 58.005 1987 49.703 1988 46.747 1989 51.673 1990 46.063 1991 52.103 1992 50.711 1993 60.354 1994 63.647 1995 53.096 1996 59.110 1997 54.745 1998 60.698 1999 56.126 2000 55.409 2001 46.842 2002 56.315 2003 44.628 2004 39.896 2005 38.980 2006 43.551 2007 41.896 2008 26.989 2009 32.117 2010 34.576 2011 36.336 2012 38.601 2013 37.792 2014 32.704 2015 31.116 2016 34.304 2017 32.250 2018 32.674 2019 31.176 2020 45.799 2021 38.663 2022 30.748 2023 32.941 2024 35.324 2025 34.547 2026 33.507 2027 32.840 2028 31.485 2029 30.868